Copy of Download custom client installer via Python

import http.client as http
import json
from urllib.parse import urlparse
from urllib.parse import urlencode
from base64 import b64encode
import hashlib
import socket
import shutil
import os

#############################
# Settings. Please edit.
#############################

#Your server URL
server_url = 'http://example.com:55414/x'


#If you have basic authentication via .htpasswd
server_basic_username = ''
server_basic_password = ''


#user needs following rights
# "settings": "all"
# "status": "some"
# "add_client": "all"
server_username='admin'
server_password='foo'


#############################
# Global script variables.
# Please do not modify.
#############################

session=""

def get_response(action, params):
    global server_url;
    global server_basic_username;
    global server_basic_password;
    global session;
    
    headers = {
        'Accept': 'application/json',
        'Content-Type': 'application/json; charset=UTF-8'
    }
    
    if('server_basic_username' in globals() and len(server_basic_username)>0):
        userAndPass = b64encode(str.encode(server_basic_username+":"+server_basic_password)).decode("ascii")
        headers['Authorization'] = 'Basic %s' %  userAndPass
    
    curr_server_url=server_url+"?"+urlencode({"a": action});
    
    if(len(session)>0):
        params["ses"]=session
    
    curr_server_url+="&"+urlencode(params);
    
    target = urlparse(curr_server_url)
    method = 'GET'
    body = ''
    
    if(target.scheme=='http'):
        h = http.HTTPConnection(target.hostname, target.port)
    elif(target.scheme=='https'):
        h = http.HTTPSConnection(target.hostname, target.port)
    else:
        print('Unkown scheme: '+target.scheme)
        raise Exception("Unkown scheme: "+target.scheme)
    
    h.request(
            method,
            target.path+"?"+target.query,
            body,
            headers)
    
    return h.getresponse();

def get_json(action, params = {}):
    
    response = get_response(action, params)
    
    if(response.status != 200):
        return ""
    
    data = response.readall();
    
    response.close()
        
    return json.loads(data.decode("utf-8"))

def download_file(action, outputfn, params):
    
    response = get_response(action, params);
    
    if(response.status!=200):
        return False
    
    with open(outputfn, 'wb') as outputf:
        shutil.copyfileobj(response, outputf)
        
    
    return True        

def md5(s):
    return hashlib.md5(s.encode()).hexdigest()


print("Logging in...")

salt = get_json("salt", {"username": server_username})

if( not ('ses' in salt) ):
    print('Username does not exist')
    exit(1)
    
session = salt["ses"];
    
if( 'salt' in salt ):
    password_md5 = md5(salt["rnd"]+md5(salt["salt"]+server_password));
    
    login = get_json("login", { "username": server_username,
                                "password": password_md5 })
    
    if('success' not in login or not login['success']):
        print('Error during login. Password wrong?')
        exit(1)
        
    print("Creating client "+socket.gethostname()+"...")
        
    status = get_json("status", { "clientname": socket.gethostname()})
    
    for client in status["client_downloads"]:
        
        if (client["name"] == socket.gethostname()):
            
            print("Downloading Installer...")
            
            if not download_file("download_client", "Client Installer.exe", {"clientid": client["id"]}):
                
                print("Downloading client failed")
                exit(1)
                
            print("Sucessfully downloaded client")
            os.startfile("Client Installer.exe")
            exit(0)
            
    print("Could not find client for download. No permission?")
    exit(1)